Using a benchmarking tool to test the limits of your apache server will help you prepare for upgrades.
Installing AB on CentOS (with cPanel)cPanel adds in an exclusion for all packages named httpd* (any files starting with httpd) to prevent accidentally overwriting apache.
SSH into your server.
Edit /etc/yum.conf and remove the entry httpd* from the Exclude line
exclude=bind-chroot courier* dov...
By steve, January 24, 2015